drivers/leds/leds-as3645a.c

/*
 * drivers/leds/leds-as3645a.c - AS3645A and LM3555 flash controllers driver
 *
 * Copyright (C) 2008-2011 Nokia Corporation
 * Copyright (c) 2011, 2017 Intel Corporation.
 *
 * Based on drivers/media/i2c/as3645a.c.
 *
 * Contact: Sakari Ailus <sakari.ailus@iki.fi>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */

#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/led-class-flash.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/slab.h>

#include <media/v4l2-flash-led-class.h>

#define AS_TIMER_US_TO_CODE(t)			(((t) / 1000 - 100) / 50)
#define AS_TIMER_CODE_TO_US(c)			((50 * (c) + 100) * 1000)

/* Register definitions */

/* Read-only Design info register: Reset state: xxxx 0001 */
#define AS_DESIGN_INFO_REG			0x00
#define AS_DESIGN_INFO_FACTORY(x)		(((x) >> 4))
#define AS_DESIGN_INFO_MODEL(x)			((x) & 0x0f)

/* Read-only Version control register: Reset state: 0000 0000
 * for first engineering samples
 */
#define AS_VERSION_CONTROL_REG			0x01
#define AS_VERSION_CONTROL_RFU(x)		(((x) >> 4))
#define AS_VERSION_CONTROL_VERSION(x)		((x) & 0x0f)

/* Read / Write	(Indicator and timer register): Reset state: 0000 1111 */
#define AS_INDICATOR_AND_TIMER_REG		0x02
#define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT	0
#define AS_INDICATOR_AND_TIMER_VREF_SHIFT	4
#define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT	6

/* Read / Write	(Current set register): Reset state: 0110 1001 */
#define AS_CURRENT_SET_REG			0x03
#define AS_CURRENT_ASSIST_LIGHT_SHIFT		0
#define AS_CURRENT_LED_DET_ON			(1 << 3)
#define AS_CURRENT_FLASH_CURRENT_SHIFT		4

/* Read / Write	(Control register): Reset state: 1011 0100 */
#define AS_CONTROL_REG				0x04
#define AS_CONTROL_MODE_SETTING_SHIFT		0
#define AS_CONTROL_STROBE_ON			(1 << 2)
#define AS_CONTROL_OUT_ON			(1 << 3)
#define AS_CONTROL_EXT_TORCH_ON			(1 << 4)
#define AS_CONTROL_STROBE_TYPE_EDGE		(0 << 5)
#define AS_CONTROL_STROBE_TYPE_LEVEL		(1 << 5)
#define AS_CONTROL_COIL_PEAK_SHIFT		6

/* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */
#define AS_FAULT_INFO_REG			0x05
#define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT	(1 << 1)
#define AS_FAULT_INFO_INDICATOR_LED		(1 << 2)
#define AS_FAULT_INFO_LED_AMOUNT		(1 << 3)
#define AS_FAULT_INFO_TIMEOUT			(1 << 4)
#define AS_FAULT_INFO_OVER_TEMPERATURE		(1 << 5)
#define AS_FAULT_INFO_SHORT_CIRCUIT		(1 << 6)
#define AS_FAULT_INFO_OVER_VOLTAGE		(1 << 7)

/* Boost register */
#define AS_BOOST_REG				0x0d
#define AS_BOOST_CURRENT_DISABLE		(0 << 0)
#define AS_BOOST_CURRENT_ENABLE			(1 << 0)

/* Password register is used to unlock boost register writing */
#define AS_PASSWORD_REG				0x0f
#define AS_PASSWORD_UNLOCK_VALUE		0x55

#define AS_NAME					"as3645a"
#define AS_I2C_ADDR				(0x60 >> 1) /* W:0x60, R:0x61 */

#define AS_FLASH_TIMEOUT_MIN			100000	/* us */
#define AS_FLASH_TIMEOUT_MAX			850000
#define AS_FLASH_TIMEOUT_STEP			50000

#define AS_FLASH_INTENSITY_MIN			200000	/* uA */
#define AS_FLASH_INTENSITY_MAX_1LED		500000
#define AS_FLASH_INTENSITY_MAX_2LEDS		400000
#define AS_FLASH_INTENSITY_STEP			20000

#define AS_TORCH_INTENSITY_MIN			20000	/* uA */
#define AS_TORCH_INTENSITY_MAX			160000
#define AS_TORCH_INTENSITY_STEP			20000

#define AS_INDICATOR_INTENSITY_MIN		0	/* uA */
#define AS_INDICATOR_INTENSITY_MAX		10000
#define AS_INDICATOR_INTENSITY_STEP		2500

#define AS_PEAK_mA_MAX				2000
#define AS_PEAK_mA_TO_REG(a) \
	((min_t(u32, AS_PEAK_mA_MAX, a) - 1250) / 250)

enum as_mode {
	AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT,
	AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT,
	AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT,
	AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT,
};

struct as3645a_config {
	u32 flash_timeout_us;
	u32 flash_max_ua;
	u32 assist_max_ua;
	u32 indicator_max_ua;
	u32 voltage_reference;
	u32 peak;
};

struct as3645a_names {
	char flash[32];
	char indicator[32];
};

struct as3645a {
	struct i2c_client *client;

	struct mutex mutex;

	struct led_classdev_flash fled;
	struct led_classdev iled_cdev;

	struct v4l2_flash *vf;
	struct v4l2_flash *vfind;

	struct device_node *flash_node;
	struct device_node *indicator_node;

	struct as3645a_config cfg;

	enum as_mode mode;
	unsigned int timeout;
	unsigned int flash_current;
	unsigned int assist_current;
	unsigned int indicator_current;
	enum v4l2_flash_strobe_source strobe_source;
};

#define fled_to_as3645a(__fled) container_of(__fled, struct as3645a, fled)
#define iled_cdev_to_as3645a(__iled_cdev) \
	container_of(__iled_cdev, struct as3645a, iled_cdev)

/* Return negative errno else zero on success */
static int as3645a_write(struct as3645a *flash, u8 addr, u8 val)
{
	struct i2c_client *client = flash->client;
	int rval;

	rval = i2c_smbus_write_byte_data(client, addr, val);

	dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,
		rval < 0 ? "fail" : "ok");

	return rval;
}

/* Return negative errno else a data byte received from the device. */
static int as3645a_read(struct as3645a *flash, u8 addr)
{
	struct i2c_client *client = flash->client;
	int rval;

	rval = i2c_smbus_read_byte_data(client, addr);

	dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval,
		rval < 0 ? "fail" : "ok");

	return rval;
}

/* -----------------------------------------------------------------------------
 * Hardware configuration and trigger
 */

/**
 * as3645a_set_config - Set flash configuration registers
 * @flash: The flash
 *
 * Configure the hardware with flash, assist and indicator currents, as well as
 * flash timeout.
 *
 * Return 0 on success, or a negative error code if an I2C communication error
 * occurred.
 */
static int as3645a_set_current(struct as3645a *flash)
{
	u8 val;

	val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT)
	    | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT)
	    | AS_CURRENT_LED_DET_ON;

	return as3645a_write(flash, AS_CURRENT_SET_REG, val);
}

static int as3645a_set_timeout(struct as3645a *flash)
{
	u8 val;

	val = flash->timeout << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;

	val |= (flash->cfg.voltage_reference
		<< AS_INDICATOR_AND_TIMER_VREF_SHIFT)
	    |  ((flash->indicator_current ? flash->indicator_current - 1 : 0)
		 << AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT);

	return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val);
}

/**
 * as3645a_set_control - Set flash control register
 * @flash: The flash
 * @mode: Desired output mode
 * @on: Desired output state
 *
 * Configure the hardware with output mode and state.
 *
 * Return 0 on success, or a negative error code if an I2C communication error
 * occurred.
 */
static int
as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on)
{
	u8 reg;

	/* Configure output parameters and operation mode. */
	reg = (flash->cfg.peak << AS_CONTROL_COIL_PEAK_SHIFT)
	    | (on ? AS_CONTROL_OUT_ON : 0)
	    | mode;

	if (mode == AS_MODE_FLASH &&
	    flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL)
		reg |= AS_CONTROL_STROBE_TYPE_LEVEL
		    |  AS_CONTROL_STROBE_ON;

	return as3645a_write(flash, AS_CONTROL_REG, reg);
}

static int as3645a_get_fault(struct led_classdev_flash *fled, u32 *fault)
{
	struct as3645a *flash = fled_to_as3645a(fled);
	int rval;

	/* NOTE: reading register clears fault status */
	rval = as3645a_read(flash, AS_FAULT_INFO_REG);
	if (rval < 0)
		return rval;

	if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
		*fault |= LED_FAULT_OVER_CURRENT;

	if (rval & AS_FAULT_INFO_INDICATOR_LED)
		*fault |= LED_FAULT_INDICATOR;

	dev_dbg(&flash->client->dev, "%u connected LEDs\n",
		rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1);

	if (rval & AS_FAULT_INFO_TIMEOUT)
		*fault |= LED_FAULT_TIMEOUT;

	if (rval & AS_FAULT_INFO_OVER_TEMPERATURE)
		*fault |= LED_FAULT_OVER_TEMPERATURE;

	if (rval & AS_FAULT_INFO_SHORT_CIRCUIT)
		*fault |= LED_FAULT_OVER_CURRENT;

	if (rval & AS_FAULT_INFO_OVER_VOLTAGE)
		*fault |= LED_FAULT_INPUT_VOLTAGE;

	return rval;
}

static unsigned int __as3645a_current_to_reg(unsigned int min, unsigned int max,
					     unsigned int step,
					     unsigned int val)
{
	if (val < min)
		val = min;

	if (val > max)
		val = max;

	return (val - min) / step;
}

static unsigned int as3645a_current_to_reg(struct as3645a *flash, bool is_flash,
					   unsigned int ua)
{
	if (is_flash)
		return __as3645a_current_to_reg(AS_TORCH_INTENSITY_MIN,
						flash->cfg.assist_max_ua,
						AS_TORCH_INTENSITY_STEP, ua);
	else
		return __as3645a_current_to_reg(AS_FLASH_INTENSITY_MIN,
						flash->cfg.flash_max_ua,
						AS_FLASH_INTENSITY_STEP, ua);
}

static int as3645a_set_indicator_brightness(struct led_classdev *iled_cdev,
					    enum led_brightness brightness)
{
	struct as3645a *flash = iled_cdev_to_as3645a(iled_cdev);
	int rval;

	flash->indicator_current = brightness;

	rval = as3645a_set_timeout(flash);
	if (rval)
		return rval;

	return as3645a_set_control(flash, AS_MODE_INDICATOR, brightness);
}

static int as3645a_set_assist_brightness(struct led_classdev *fled_cdev,
					 enum led_brightness brightness)
{
	struct led_classdev_flash *fled = lcdev_to_flcdev(fled_cdev);
	struct as3645a *flash = fled_to_as3645a(fled);
	int rval;

	if (brightness) {
		/* Register value 0 is 20 mA. */
		flash->assist_current = brightness - 1;

		rval = as3645a_set_current(flash);
		if (rval)
			return rval;
	}

	return as3645a_set_control(flash, AS_MODE_ASSIST, brightness);
}

static int as3645a_set_flash_brightness(struct led_classdev_flash *fled,
					u32 brightness_ua)
{
	struct as3645a *flash = fled_to_as3645a(fled);

	flash->flash_current = as3645a_current_to_reg(flash, true, brightness_ua);

	return as3645a_set_current(flash);
}

static int as3645a_set_flash_timeout(struct led_classdev_flash *fled,
				     u32 timeout_us)
{
	struct as3645a *flash = fled_to_as3645a(fled);

	flash->timeout = AS_TIMER_US_TO_CODE(timeout_us);

	return as3645a_set_timeout(flash);
}

static int as3645a_set_strobe(struct led_classdev_flash *fled, bool state)
{
	struct as3645a *flash = fled_to_as3645a(fled);

	return as3645a_set_control(flash, AS_MODE_FLASH, state);
}

static const struct led_flash_ops as3645a_led_flash_ops = {
	.flash_brightness_set = as3645a_set_flash_brightness,
	.timeout_set = as3645a_set_flash_timeout,
	.strobe_set = as3645a_set_strobe,
	.fault_get = as3645a_get_fault,
};

static int as3645a_setup(struct as3645a *flash)
{
	struct device *dev = &flash->client->dev;
	u32 fault = 0;
	int rval;

	/* clear errors */
	rval = as3645a_read(flash, AS_FAULT_INFO_REG);
	if (rval < 0)
		return rval;

	dev_dbg(dev, "Fault info: %02x\n", rval);

	rval = as3645a_set_current(flash);
	if (rval < 0)
		return rval;

	rval = as3645a_set_timeout(flash);
	if (rval < 0)
		return rval;

	rval = as3645a_set_control(flash, AS_MODE_INDICATOR, false);
	if (rval < 0)
		return rval;

	/* read status */
	rval = as3645a_get_fault(&flash->fled, &fault);
	if (rval < 0)
		return rval;

	dev_dbg(dev, "AS_INDICATOR_AND_TIMER_REG: %02x\n",
		as3645a_read(flash, AS_INDICATOR_AND_TIMER_REG));
	dev_dbg(dev, "AS_CURRENT_SET_REG: %02x\n",
		as3645a_read(flash, AS_CURRENT_SET_REG));
	dev_dbg(dev, "AS_CONTROL_REG: %02x\n",
		as3645a_read(flash, AS_CONTROL_REG));

	return rval & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0;
}

static int as3645a_detect(struct as3645a *flash)
{
	struct device *dev = &flash->client->dev;
	int rval, man, model, rfu, version;
	const char *vendor;

	rval = as3645a_read(flash, AS_DESIGN_INFO_REG);
	if (rval < 0) {
		dev_err(dev, "can't read design info reg\n");
		return rval;
	}

	man = AS_DESIGN_INFO_FACTORY(rval);
	model = AS_DESIGN_INFO_MODEL(rval);

	rval = as3645a_read(flash, AS_VERSION_CONTROL_REG);
	if (rval < 0) {
		dev_err(dev, "can't read version control reg\n");
		return rval;
	}

	rfu = AS_VERSION_CONTROL_RFU(rval);
	version = AS_VERSION_CONTROL_VERSION(rval);

	/* Verify the chip model and version. */
	if (model != 0x01 || rfu != 0x00) {
		dev_err(dev, "AS3645A not detected "
			"(model %d rfu %d)\n", model, rfu);
		return -ENODEV;
	}

	switch (man) {
	case 1:
		vendor = "AMS, Austria Micro Systems";
		break;
	case 2:
		vendor = "ADI, Analog Devices Inc.";
		break;
	case 3:
		vendor = "NSC, National Semiconductor";
		break;
	case 4:
		vendor = "NXP";
		break;
	case 5:
		vendor = "TI, Texas Instrument";
		break;
	default:
		vendor = "Unknown";
	}

	dev_info(dev, "Chip vendor: %s (%d) Version: %d\n", vendor,
		 man, version);

	rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE);
	if (rval < 0)
		return rval;

	return as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE);
}

static int as3645a_parse_node(struct as3645a *flash,
			      struct as3645a_names *names,
			      struct device_node *node)
{
	struct as3645a_config *cfg = &flash->cfg;
	const char *name;
	int rval;

	flash->flash_node = of_get_child_by_name(node, "flash");
	if (!flash->flash_node) {
		dev_err(&flash->client->dev, "can't find flash node\n");
		return -ENODEV;
	}

	rval = of_property_read_string(flash->flash_node, "label", &name);
	if (!rval)
		strlcpy(names->flash, name, sizeof(names->flash));
	else
		snprintf(names->flash, sizeof(names->flash),
			 "%s:flash", node->name);

	rval = of_property_read_u32(flash->flash_node, "flash-timeout-us",
				    &cfg->flash_timeout_us);
	if (rval < 0) {
		dev_err(&flash->client->dev,
			"can't read flash-timeout-us property for flash\n");
		goto out_err;
	}

	rval = of_property_read_u32(flash->flash_node, "flash-max-microamp",
				    &cfg->flash_max_ua);
	if (rval < 0) {
		dev_err(&flash->client->dev,
			"can't read flash-max-microamp property for flash\n");
		goto out_err;
	}

	rval = of_property_read_u32(flash->flash_node, "led-max-microamp",
				    &cfg->assist_max_ua);
	if (rval < 0) {
		dev_err(&flash->client->dev,
			"can't read led-max-microamp property for flash\n");
		goto out_err;
	}

	of_property_read_u32(flash->flash_node, "voltage-reference",
			     &cfg->voltage_reference);

	of_property_read_u32(flash->flash_node, "ams,input-max-microamp",
			     &cfg->peak);
	cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak);

	flash->indicator_node = of_get_child_by_name(node, "indicator");
	if (!flash->indicator_node) {
		dev_warn(&flash->client->dev,
			 "can't find indicator node\n");
		goto out_err;
	}

	rval = of_property_read_string(flash->indicator_node, "label", &name);
	if (!rval)
		strlcpy(names->indicator, name, sizeof(names->indicator));
	else
		snprintf(names->indicator, sizeof(names->indicator),
			 "%s:indicator", node->name);

	rval = of_property_read_u32(flash->indicator_node, "led-max-microamp",
				    &cfg->indicator_max_ua);
	if (rval < 0) {
		dev_err(&flash->client->dev,
			"can't read led-max-microamp property for indicator\n");
		goto out_err;
	}

	return 0;

out_err:
	of_node_put(flash->flash_node);
	of_node_put(flash->indicator_node);

	return rval;
}

static int as3645a_led_class_setup(struct as3645a *flash,
				   struct as3645a_names *names)
{
	struct led_classdev *fled_cdev = &flash->fled.led_cdev;
	struct led_classdev *iled_cdev = &flash->iled_cdev;
	struct led_flash_setting *cfg;
	int rval;

	iled_cdev->name = names->indicator;
	iled_cdev->brightness_set_blocking = as3645a_set_indicator_brightness;
	iled_cdev->max_brightness =
		flash->cfg.indicator_max_ua / AS_INDICATOR_INTENSITY_STEP;
	iled_cdev->flags = LED_CORE_SUSPENDRESUME;

	rval = led_classdev_register(&flash->client->dev, iled_cdev);
	if (rval < 0)
		return rval;

	cfg = &flash->fled.brightness;
	cfg->min = AS_FLASH_INTENSITY_MIN;
	cfg->max = flash->cfg.flash_max_ua;
	cfg->step = AS_FLASH_INTENSITY_STEP;
	cfg->val = flash->cfg.flash_max_ua;

	cfg = &flash->fled.timeout;
	cfg->min = AS_FLASH_TIMEOUT_MIN;
	cfg->max = flash->cfg.flash_timeout_us;
	cfg->step = AS_FLASH_TIMEOUT_STEP;
	cfg->val = flash->cfg.flash_timeout_us;

	flash->fled.ops = &as3645a_led_flash_ops;

	fled_cdev->name = names->flash;
	fled_cdev->brightness_set_blocking = as3645a_set_assist_brightness;
	/* Value 0 is off in LED class. */
	fled_cdev->max_brightness =
		as3645a_current_to_reg(flash, false,
				       flash->cfg.assist_max_ua) + 1;
	fled_cdev->flags = LED_DEV_CAP_FLASH | LED_CORE_SUSPENDRESUME;

	rval = led_classdev_flash_register(&flash->client->dev, &flash->fled);
	if (rval) {
		led_classdev_unregister(iled_cdev);
		dev_err(&flash->client->dev,
			"led_classdev_flash_register() failed, error %d\n",
			rval);
	}

	return rval;
}

static int as3645a_v4l2_setup(struct as3645a *flash)
{
	struct led_classdev_flash *fled = &flash->fled;
	struct led_classdev *led = &fled->led_cdev;
	struct v4l2_flash_config cfg = {
		.intensity = {
			.min = AS_TORCH_INTENSITY_MIN,
			.max = flash->cfg.assist_max_ua,
			.step = AS_TORCH_INTENSITY_STEP,
			.val = flash->cfg.assist_max_ua,
		},
	};
	struct v4l2_flash_config cfgind = {
		.intensity = {
			.min = AS_INDICATOR_INTENSITY_MIN,
			.max = flash->cfg.indicator_max_ua,
			.step = AS_INDICATOR_INTENSITY_STEP,
			.val = flash->cfg.indicator_max_ua,
		},
	};

	strlcpy(cfg.dev_name, led->name, sizeof(cfg.dev_name));
	strlcpy(cfgind.dev_name, flash->iled_cdev.name, sizeof(cfg.dev_name));

	flash->vf = v4l2_flash_init(
		&flash->client->dev, of_fwnode_handle(flash->flash_node),
		&flash->fled, NULL, &cfg);
	if (IS_ERR(flash->vf))
		return PTR_ERR(flash->vf);

	flash->vfind = v4l2_flash_indicator_init(
		&flash->client->dev, of_fwnode_handle(flash->indicator_node),
		&flash->iled_cdev, &cfgind);
	if (IS_ERR(flash->vfind)) {
		v4l2_flash_release(flash->vf);
		return PTR_ERR(flash->vfind);
	}

	return 0;
}

static int as3645a_probe(struct i2c_client *client)
{
	struct as3645a_names names;
	struct as3645a *flash;
	int rval;

	if (client->dev.of_node == NULL)
		return -ENODEV;

	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
	if (flash == NULL)
		return -ENOMEM;

	flash->client = client;

	rval = as3645a_parse_node(flash, &names, client->dev.of_node);
	if (rval < 0)
		return rval;

	rval = as3645a_detect(flash);
	if (rval < 0)
		goto out_put_nodes;

	mutex_init(&flash->mutex);
	i2c_set_clientdata(client, flash);

	rval = as3645a_setup(flash);
	if (rval)
		goto out_mutex_destroy;

	rval = as3645a_led_class_setup(flash, &names);
	if (rval)
		goto out_mutex_destroy;

	rval = as3645a_v4l2_setup(flash);
	if (rval)
		goto out_led_classdev_flash_unregister;

	return 0;

out_led_classdev_flash_unregister:
	led_classdev_flash_unregister(&flash->fled);

out_mutex_destroy:
	mutex_destroy(&flash->mutex);

out_put_nodes:
	of_node_put(flash->flash_node);
	of_node_put(flash->indicator_node);

	return rval;
}

static int as3645a_remove(struct i2c_client *client)
{
	struct as3645a *flash = i2c_get_clientdata(client);

	as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);

	v4l2_flash_release(flash->vf);

	led_classdev_flash_unregister(&flash->fled);
	led_classdev_unregister(&flash->iled_cdev);

	mutex_destroy(&flash->mutex);

	of_node_put(flash->flash_node);
	of_node_put(flash->indicator_node);

	return 0;
}

static const struct i2c_device_id as3645a_id_table[] = {
	{ AS_NAME, 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, as3645a_id_table);

static const struct of_device_id as3645a_of_table[] = {
	{ .compatible = "ams,as3645a" },
	{ },
};
MODULE_DEVICE_TABLE(of, as3645a_of_table);

static struct i2c_driver as3645a_i2c_driver = {
	.driver	= {
		.of_match_table = as3645a_of_table,
		.name = AS_NAME,
	},
	.probe_new	= as3645a_probe,
	.remove	= as3645a_remove,
	.id_table = as3645a_id_table,
};

module_i2c_driver(as3645a_i2c_driver);

MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>");
MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones");
MODULE_LICENSE("GPL v2");